648209924 has 24 divisors (see below), whose sum is σ = 1157046240. Its totient is φ = 317680704.

The previous prime is 648209899. The next prime is 648209927. The reversal of 648209924 is 429902846.

It is a happy number.

It is a super-2 number, since 2×648209924² = 840352211144171552, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (648209927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40787 + ... + 54405.

It is an arithmetic number, because the mean of its divisors is an integer number (48210260).

Almost surely, 2^648209924 is an apocalyptic number.

It is an amenable number.

648209924 is a deficient number, since it is larger than the sum of its proper divisors (508836316).

648209924 is a wasteful number, since it uses less digits than its factorization.

648209924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13859 (or 13857 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 648209924 is about 25459.9670856032. The cubic root of 648209924 is about 865.4431774038.

The spelling of 648209924 in words is "six hundred forty-eight million, two hundred nine thousand, nine hundred twenty-four".